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<Title>Gradient Bar Shading</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Gradient Bar Shading</p>
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<img src="images/gradientbar.png" width='600' height='380'>
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This example demonstrates using bar gradient shading for a horizontal bar chart. It also demonstrates using gradient color background, partially rounded frame, and automatic resizing of the plot area to fit the chart.<br><br>
<ul><li> The gradient background is achieved by using <a href="BaseChart.linearGradientColor.htm">BaseChart.linearGradientColor</a> to define the gradient color, then use <a href="BaseChart.setBackground.htm">BaseChart.setBackground</a> to set it as the chart background color.<br><br>
<li> The partially rounded frame is configured using <a href="BaseChart.setRoundedFrame.htm">BaseChart.setRoundedFrame</a>. Note that only 2 of the 4 corners are rounded.<br><br>
<li> The x-axis and y-axis are swapped using <a href="XYChart.swapXY.htm">XYChart.swapXY</a>, so the bars become horizontal.<br><br>
<li> The bar gradient effect is defined using <a href="Chart.barLighting.htm">Chart.barLighting</a>, then applied to the bars using <a href="Layer.setBorderColor.htm">Layer.setBorderColor</a>.<br><br>
<li> After the entire chart is configured, the <a href="XYChart.packPlotArea.htm">XYChart.packPlotArea</a> method is used  to adjust the plot area size, so as to fit the plot area and the axes in a given  bounding box.</ul>
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/gradientbar.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the bar chart
double[] data = {1350, 1600, 1950, 2300, 2700};

// The labels for the bar chart
String[] labels = {"2001", "2002", "2003", "2004", "2005"};

// The colors for the bars
int[] colors = {0xcc0000, 0x66aaee, 0xeebb22, 0xcccccc, 0xcc88ff};

// Create a PieChart object of size 600 x 380 pixels.
XYChart c = new XYChart(600, 380);

// Use the white on black palette, which means the default text and line colors are white
c.setColors(Chart.whiteOnBlackPalette);

// Use a vertical gradient color from blue (0000cc) to deep blue (000044) as background. Use rounded
// corners of 30 pixels radius for the top-left and bottom-right corners.
c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), 0x0000cc, 0x000044));
c.setRoundedFrame(0xffffff, 30, 0, 30, 0);

// Add a title using 18pt Times New Roman Bold Italic font. Add 6 pixels top and bottom margins to
// the title.
TextBox title = c.addTitle("Annual Revenue for Star Tech", "Times New Roman Bold Italic", 18);
title.setMargin2(0, 0, 6, 6);

// Add a separator line in white color just under the title
c.addLine(20, title.getHeight(), c.getWidth() - 21, title.getHeight(), 0xffffff);

// Tentatively set the plotarea at (70, 80) and of 480 x 240 pixels in size. Use transparent border
// and white grid lines
c.setPlotArea(70, 80, 480, 240, -1, -1, Chart.Transparent, 0xffffff);

// Swap the axis so that the bars are drawn horizontally
c.swapXY();

// Add a multi-color bar chart layer using the supplied data. Use bar gradient lighting with the
// light intensity from 0.75 to 2.0
c.addBarLayer3(data, colors).setBorderColor(Chart.Transparent, Chart.barLighting(0.75, 2.0));

// Set the labels on the x axis.
c.xAxis().setLabels(labels);

// Show the same scale on the left and right y-axes
c.syncYAxis();

// Set the bottom y-axis title using 10pt Arial Bold font
c.yAxis().setTitle("USD (millions)", "Arial Bold", 10);

// Set y-axes to transparent
c.yAxis().setColors(Chart.Transparent);
c.yAxis2().setColors(Chart.Transparent);

// Disable ticks on the x-axis by setting the tick color to transparent
c.xAxis().setTickColor(Chart.Transparent);

// Set the label styles of all axes to 8pt Arial Bold font
c.xAxis().setLabelStyle("Arial Bold", 8);
c.yAxis().setLabelStyle("Arial Bold", 8);
c.yAxis2().setLabelStyle("Arial Bold", 8);

// Adjust the plot area size, such that the bounding box (inclusive of axes) is 30 pixels from the
// left edge, 25 pixels below the title, 50 pixels from the right edge, and 25 pixels from the
// bottom edge.
c.packPlotArea(30, title.getHeight() + 25, c.getWidth() - 50, c.getHeight() - 25);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "", "title='Year {xLabel}: US$ {value}M'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Gradient Bar Shading&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Gradient Bar Shading
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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